dosing

ive searched the site and fuond nothing but i was just wondering if dosing harms the turbos at all i just bought a intercooler of ltd (thanx mate) and i want it to dose but dont wanna ruin the turbos what do u guys think??

 

I've no idea what you are talking about.

Any more information you can provide us about this "dosing"?

 

um you no the sounds that vl turbos make thats dosing, where instead of the boost escaping from the bov or recit valve the boost pressure goes back through the turbo and out the pod filter if im wrong someone correct and i was wondering if this is bad for the turbo

 

Just looked into it. Yeh it's bad. Basically, the sound you are hearing is compressor surge, and it's not good for your turbos.

 

I think its what we would call turbo flutter or what the VL turbo guys call fully sik dosing. Basically they stop the factory recirc air system from recircuating air when you get off the throttle. So you block off the recirc valves and then when you give it some stick and jump off the throttle, the throttle bodies close and the charged air has no way to escape into the atmospere (BOV) or back into the intake. So it backs up all the way to the turbos and slows them down resulting in the "TU TU TU TU " sound. Do a you tube search and you'll hear what I'm talking about.
Not sure if it damages turbo's but I'd imagine it wouldnt be good for them.

edit: I wish I could type faster. Now it looks like I was copying kurtee...

 

yeah i just heard from someone that they reduce turbo life by like 5000ks so yeah dunno if its worth "dosing" the 300

 

I don't think a 300 needs the dose pipes to attract the attention. The car pulls enough looks completely stock, standing still. :zlove: I think the VL turbos need that sound to pull the looks, otherwise its just another commodore. And I guess even if they do wreck a turbo they;ve only got one turbo to replace.

I think topher said he was going to try it before he got new turbos that way it doesnt matter if he wrecks his turbos. His car sounds awesome now with BOV's, it'll sound crazy with dose pipes.

 

I had my recircs blocked off on standard boost and it sounded ok.. then I boosted my car and it was way too loud (ie. like a bt1) so I unblocked them, i've since lowered my boost back to stock but I've left the recircs unblocked.. the only reason you would do it is for the sound.. just buy some BOV's, theres no real hard proof that it harms your turbos, but there is no hard proof it doesn't either.. not worth the risk in my opinion

 

A lot of other Nissan models feature 'em (in Sydney at least.) Why join the herd?

 

i used to have a good dose goin, got a vid of it too, but i chose to go back to bov's didnt wanna kill the turbos

 

I thought 'dosing' did refer to videos..

at least the ones ive seen it did

 

yeah i got the bovs but just wanted something different might try it for a little while

 

lol there is proof it hurts the turbos...?

its kinda obvious isnt it, forcing the wheel the spin in the opposite direction, creating twice as much work for the turbo, so you could pretty much say that it will decrease your turbos life by about 25% (not 50% air goes back)

you could do it if it means that much for your fully sickness, and hell you could also add Dose to your massive shopping list you have full sic uleh?

 

its called compressor surge in which ZDUCTIV said... What happens is the air comes back though the turbo once you take your foot off the go pedal and the air rushes back though the turbo in which turns the blades the other way... It does harm the turbo itself and does reduce the life and can also chip the blades on the housing...

VL turbos do not come stock with recircs at all.. They had an overboost valve which when boosted above 10psi and you still had it installed would open up and lower the boost level once it went over 10psi... A lot remove it and use a bung in place so this does not happen which allows them to run higher boost before going to an aftermarket plenum which alot of people seem to go... You can get the flutter with just the stock std airbox without an intercooler installed just with the crossover pipe... Its not very loud at all but at times on a cold night you would be able to hear it just...

the sound after a while can give you the sh|ts...

 

do u know how fast those fans are spinniing inside the turbo, i dont think theres any chance of air gushing back to the fan causing it to spin the other way....the air would gush back onto the fan which is spinning forward causing a friction in the noise it creates...i mean if anything it would slow the speed of the fan down a lil but marginal...it fkz the fan up coz its air forcing the fan to slow down and go the other way so there would be tension there....but to actually stop fully and spin the other way i dont think it does....

 

chad i imagine when you say fan your talking about the compressor wheel?

the thing is while you change gears, and the clutch is enguaged... the plenum closes off and any air left is discharged via blow off valves or pushed back around the re-circ's this all happens very fast as the air is compressed and accelerated, and while your changing gears, i imagine the compressor would stop spinning? or slow down atleast, then you have this air which has been compressed to its optimal point running back the exact direction it came from, passing through the compressor wheel, making it spin the opposite direction, probably why if you change the gears fast u only get a little sound, but if u change slow you get a bigger one.

iono how people could not see how it could hurt the turbo tho, how can stuff going out of a thing that only lets stuff in be a good thing... its like stuff going INSIDE your bumhole... its just not cricket.

 

Do you know how fast air enters when you hit boost... Remember turbos are dirven by exhaust gases... If a BOV etc is not fitted the air has no where to go and it comes back though the turbo and out the way it come in... scump is correct in what his saying... And it is correct that the air comes back though the turbo which is called compressor surge.. The BOV vents the pressure out so that the compressor surge does not happen and does not reduce the life of the turbo/s...

here you go this is taken from the GFB site...

I use to own VL's before i got my zed... You watch some of the young kids who sit there at places and just raise the rev's so they can hear the flutter while parked that does hurt the turbo/s and like i said can damage the compressor itself, chip the blades which i have seen myself due to stupid people that go around dosing people and can reduce the life of the turbo...

 

The removal of this effect is the exact reason why we fit BOV's to our engines. Why on Earth would you want to generate it?

 

cuz its fully sik bro

 

mmm interesting thanx zanjara...i always thought that the compresser fan in the turbo is spinning incredibly fast and that air would no way be able to force it to slow down and spin the other way, and that the noise it makes is the friction....thanx for clearing that up...

NICK ur fully shick you had it